Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: bpf: Mark signal tracepoint siginfo arguments as scalar The signal_generate and signal_deliver tracepoints declare their info argument as a struct kernel_siginfo pointer. btf_ctx_access() therefore treats it as a trusted pointer for tp_btf programs. Signal delivery also uses SEND_SIG_NOINFO and SEND_SIG_PRIV as special values for this argument. Those values are zero and one respectively, and are not pointers. A tp_btf program can currently dereference either value and fault the kernel. In particular, signal_generate can run from timer interrupt context, turning the fault into a kernel panic. Record both tracepoints in raw_tp_null_args[] and mark argument one as a non-pointer. This preserves scalar access to the cookie while rejecting direct and helper-mediated pointer use. Merely marking it nullable would not suffice because SEND_SIG_PRIV is nonzero.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b2fc4b17fc13810ef440fb323fad3981cd174985 before 05757377fa0447163d07c43a119f81abe1eef8dc; affected 838a10bd2ebfe11a60dd67687533a7cfc220cc86 before 0e78cb242a57e481061fcb542fed4d51afba25c4; affected 838a10bd2ebfe11a60dd67687533a7cfc220cc86 before d2eaea3599bcce659ce91862254dc91bcbdb6351; affected 838a10bd2ebfe11a60dd67687533a7cfc220cc86 before 77515ab12e4983e6416f8c35039a3f0c0822ac70; affected 6.12.6 before 6.12.114 |
| Linux / Linux | affected 6.13; unaffected 0 before 6.13; unaffected 6.12.114 through 6.12.*; unaffected 6.18.53 through 6.18.*; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.